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Gabriel Johnson was 8-months-old when he was last spotted alive.

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Jury adds aggravating circumstances provision to three convictions

Next court date is November 1, to set sentencing date

Elizabeth Johnson also was originally charged with kidnapping, but jury couldn't reach verdict

"Baby Gabriel" disappeared in 2009 when he was 8 months old

Elizabeth Johnson -- whose 8-month-old baby, Gabriel, disappeared in 2009 after she allegedly took him to Texas -- was found guilty Thursday of unlawful imprisonment and custodial interference.

Johnson also was originally charged with kidnapping, but the jury couldn't reach a verdict on that charge.

Instead, the jury found her guilty with aggravating circumstances on the lesser charge of imprisonment and two custodial interference charges. Her next appearance in court will be November 1 when the judge will set a sentencing date. She has already served nearly three years in jail, having been taken into custody shortly after Gabriel disappeared.

He was 8 months old when he was last spotted alive at a Texas motel in late 2009. What happened to him is unclear. Johnson originally told the boy's father that she had killed Gabriel, but after she was arrested, she told police that she gave the baby to an anonymous couple in San Antonio, CNN affiliate KPHO-TV reported.

Police in San Antonio searched a landfill and found nothing. There also have been searches in Arizona and Florida, according to HLN, the sister network to CNN.

The San Antonio police website lists Gabriel as a missing person.

The mystery began December 17, 2009, after a judge awarded Johnson and Logan McQueary, the boy's father, joint custody of Gabriel. But Johnson allegedly defied the ruling and set out for Texas with her son.

McQueary didn't hear from Johnson until several days later, when she reportedly sent him a text message saying she'd killed Gabriel and put his body in a Dumpster.

"I killed him," Johnson said in a text to McQueary on December 27, 2009. "U will never see Gabriel again, I made sure of that. And you can spend the rest of ur pathetic life wondering about him."